Cam-driven pump



JupelG, 1925. 1,542,312

S. W. LUITWIEI ER cm muvs'u PUMP Filed Sept, 27. 1922 3 Sheets-Sheet 1 1- 3 21 60 3 2 INVENTOR n 22 SAMUEL W. LUITWIELER.

I Q 1 I ATTORNEY s. w. LUITWIELER June 16. 1925.

3 Sheets-Sheet 2 Z INVENTOR WL2H'WIELEH. ATTORNEY June 16, 1925.

- S. W. LUITWIELER CAI DRIVEN PUIP w m m w M Q v 3 Q 2 \PT hr m m K Y val r/r i m J H q T 1 m M Z 4 M SAMUEL W. LUITWIELER- Patented June 16, 1925..

. UNITED STAT ES OFFICE-g CAM-DRIVEN PUMP.

Application filed September 27,1922. Serial No. 590,858.

To all whom it mag concern:

Be it known that I, SAMUEL W. LUIT- WIELER, a citizen of the United States of America, residing at Rochester, in the county of Monroe and State of New York,

have, invented certain new and useful Improvements in Cam-Driven vPumps, of which the following is a specification.

My invention relates to a cam driven pump, and embodies various improvements over the types of pumps disclosedin my prior Patents No. 819,295, patented'May 1, 1906. and No. 926,267, patented June '29, 1909- r In a more particular aspect, this invention has for its purpose toafford a cam driven pump especially adapted to deep well work, although susceptible of other uses, and with which a water column can be keptin motioncontinuously at constant volume and under constant pressure, without the necessity of any air chamber, and in such a mannor as to practically eliminate vibration or pulsation, giving anapproximately steady flow of water.

Another object of the improvement is to afford a pump of the-general type set forth,

embodying "a frame characterized by extreme strength and stiffness, and arranged so that the structure can be manufactured and assembled at a low cost, and having the additional advantage of not being affected as to efficiencyor proper operation by wear of the parts. r With these ends in view, the invention includes the novel arrangement that will appear clearly from the following description,

in conjunction with the accompanyingdrawings, thenovel feature being pointed out in the claims following the specification.

In thedrawings:

Figure 1 is a side elevation of a pump embodying a preferred arrangement ofmy invention, the framebeing partially broken away; v r i I Figure 2 is a plan view of the parts appearing' in Figure 1, with a portion of the frame broken away at the top;

1 Figure 3 is a vertical sectional view on line 3+3 of Figure 1 I "i Figure 'is a horizontal sectional view on line 4-4 ofFigure 1;-

-' a Figure 5 isv a fsi'de elevation ofthe c am, showing in diagram the cooperating rollers,

and-the system accordingto which the cam v r is held in rigid engagement with the guiderisulaidmltl w necting front plate 4.

eral

Figure 6' is a central sectional view of the cam, and

Figure 7 is a diagram illustrating the relation between the cam and the work to be performed.

Referring more particularly to the drawings in which like reference numerals correspond to similar parts in the several views, the structure comprises a frame which includes a base 1 and integral columns or standards 2 arranged at the sides of the base and forwardly thereof, while 3 designates a top member which is of general U- shaped contour, and formed integral with the columns 2. r

The top member 3 extends rearwardly from the columns 2 and the frame is braced at the front and top by an integral con- Arranged between and secured to the base 1 and top member 3 of the frame are front guide-rods 6, disposed outwardly of the cams to be mentioned presently, and rear 'guide rods 7 disposed between said cams, and on said guide-rods travel the cam frames, also to be described presently. The cam-shaft is designated at 8, being journalled in suitable fixed bearings 9 of the frame and having fixed thereon a gearlO engaged and driven by a pinion 11 on the pulley shaft 12 to which power is furnished through the pulley 13 or other wise.

It is highly'important and essential to niembers'embodying lugs 14 carried by and preferably formed integral with the columns 2at points about midwaybetween the top'and bottom of the frame, said lugs 14 having vertical openings through which the guide-rods 6 are inserted in assembling,

and by tying these guide-rods at their centers in the manner just described, they are held effectively against the slightest latstrain and afford an absolutely rigid guide for the cam frames. In order to similarly brace the rear guide-rods 7, I

'employa bracing member consisting of a bracket or yoke 15 supported on the camshaft 8, as shown in Figure 4, bymeans of an-opening through which said camshaft passes, and having recesses or pockets embracing "the, guidesrods "I, The bracket 15 rods 7 by means of a removable locking plate 16, thus affording a simple, economical, and practical means for rigidly bracing the rear guide-rods 7 at a point intermediate their tops and bottoms.

In the pump disclosed, there are twofcams oppositely arranged and fixed upon the camshaft, 8, and each cooperating with rollers at the top and bottom of a separate cam frame. Referring to-Figure 1-, the upper cam A cooperates with rollers at, the top and bottom of a cam frame thatis attached to and operates a solid pump rod 17, while the lower cam B cooperates'wlth roller-s at the top and bottom of a cam frame'that is connected to and operates'a hollow pump rod 18 surrounding the solid pump rod 17, said solid and hollow pump rods being connected to pistons which are located sufliciently far apart in the'work ing cylinder to permit the necessary alte'r nating stroke, as'well known in this type of pump. To accomplish this, the hollow pump rod 18 is secured by means of a split collar 19 which is bolted to the pump rod and is carried by the cross-head 20 of the corresponding cam frame, while the solid pump rod 17 passes through an opening in a lug 21 that is carried by the cross-head 22 of the corresponding cam frame.

The cross-head 20 carries a cam-engaging roller and is connected by vertical tie-rods 23 to an upper cross-head 24, which also carries a cam-engaging roller, saidtie-rods being fixed'to the lower cross-head and eX-,

tending through openings in the upper cross-head and adjustably held in engagement therewith by means of nuts on opposite sides of the crosshead. This permits of readily and accurately adjusting the cam frames and rollers to the periphery of the cam; The cross-heads 20' and 24 are provided with integral guide loops 25 and 26 which travel on the front and rear guiderods 6 and 7 respectively, while the crosshead 22, carrying a cam-engaging roller, is similarly connected by tie-rods 27 with a cross+head 28, also carrying a cam engaging roller, said cross-heads 22 and 28 having guide loops 29 and 30 sliding on the corresponding front andrear rods 6 and 7. The cam A, asit rotates, operates the cam frame embracing the cross-heads 22 and 28, while cam B operates the cam frame embracing the cross-heads20 and 24', and I will now describe the novel characteristics of the cam that I employ foreffecting the necessary movements of the cro.ssheads.

Figures 5 to 7 illustrate the peripheral outline-of the cam and the method-of laying it out. The cam is of symmetrical form, and so designed as to produce anapproximately constant discharge of liquid at all times; To accomplish this, it IlSz' necessary that. the cam frames. traveluni fnrmlv throughout practically their entire path of movement, and this is'eifected in the present structure by having the effective contour of the cam of a uniformly increasing distance from the axis of thecam.

In Figure 7, the inclined straight line 5/: represents the discharge of water and is a constant factor, the horizontal line y represents the starting point of the cam, and the vertical lines- 2' represent the constantly increasing distances of the cam surface from the axis of the cam. Referring to Figure 5, starting with the fixed points, including the cam axis a", and the centers 7), 0, of the rollers which engage the cam periphery, the contour'of the cam is obtained by first striking the various radial lines cl which are equal distances apart measured on a concentric circle 6 e. The centers f for striking; the arcs from which to chart the cam, are then established by measuring on each radialline (Z a distance beyond the circle Z2 6 equal to the length of the correspond ing line 2 in Figure 7. Then by striking a series of arcs about centers f with a radius equal to the radius-of the roller, points are found which establish the curve of the cam. As amatter of working practice, it is desirable to provide the cam with a flat base, and to flatten out the cam at its outermost point instead of letting the curve run to a sharppoint, in order to aflorda continuous curve, and the effect ofthis is illustrated by the curved line g g in Figure 7.v \Vhile this resultsin a slightly decreased movement of the cam frame when the outermost point of the cam isoperating, the-speed of' travel is correspondingly increased, owing to the greater distance from the center of the cam, and the liquid being discharged at this increased speed carries the stream, and bridges what would otherwise be a gap between the successive action of the cams;

lVh'ile I have described the invention as applied to'a'particular embodiment, it is not limited to the precise arrangements or details herein disclosed, but this applicatiolr is intended to cover any modifications or departures-from the mechanismset forth that may come within the intended purposes ofthe invention or the scope of the following claims;

I- claim:

1. In a pump, the combination with a cam-shaft and cam fixed thereon, of a cam frame including upper and lower crossheads carrying rollers engaging the cam at opposite points of its'periphery, a" front guide-rod disposed at one side of said cam, a rear guidei-rodi disposed? at the opposite side of the cam, and guide l-oops carried by said crossg-heads and traivelling'on the guiderods; a I

2. I n -apump,-- thecombination a c m-sha t and, cam fixed thereongiofa-cam frame including upper and lower, crossheads carrying rollers engaging the cam at opposite points of its periphery, tie-rods carried by one of said cross-heads and adj ustably connected to the other of said crossheads, guide-rods for the cam frames, and guide loops carried by'the cross-heads and travelling on said guide-rods.

3. In a pump, the combination with a cam-shaft and cam fixed thereon, of a cam frame including upper and lower crossheads carrying rollers engaging the cam at opposite points of its periphery, tierods carried by one of said cross-heads and adjustably connected to the other of said cross-heads, a front guide-rod disposed at one side of said cam, a 'rear guide-rod disposed at the opposite side of the cam, and guide loops carried by said cross-heads and travelling on the guide-rods.

4. In a pump, the combination with a cam-shaft and a cam fixed thereon, of a frame including a base, avertical column, and a top member, guide-rods secured'between the base and top member, a bracing member carried by said column intermediate its base and top member and embracing one of said guide-rods, and a cam frame movable on said guide-rods and carrying rollers engaging the cam at opposite points.

5; In a pump, the combination with a cam shaft and a cam fixed thereon, of a frame including a base, vertical columns, and a top member, guide-rods secured between the base and top member, a bracing member supported by said cam-shaft and embracing one of said guide-rods at a point intermediate the base and top member, and a cam frame movable on said guide-rods and carrying rollers engaging the cam at opposite points.

6. Ina pump, the combination with a cam-shaft and a pair of cams fixed thereon, of a frame including a base, vertical col-' umns, and a top member, front and rear guide-rods secured between the base and top member, bracing members carried by the columns intermediate the base and top member and embracing said front guide-rods, a bracing member supported by said camshaft and embracing said rear guide-rods at a point intermediate the base and top member, and cam frames movable on said guiderods and carrying rollers engaging the cams at opposite points.

7. In a pump, the combination with a cam-shaft and a pair of cams fixed thereon, of a frame including a base, vertical columns, and a U-shaped top member, front and rear guide-rods secured between the top member and base, the front guide-rods being located outwardly of said cams and p the rear guide-rods being located between the cams adjacent to the center of the vU-shaped top member, bracing members carried by the columns intermediate the base and top member and embracing said front guide-rods, a bracing member supported by said cam-shaft and embracing said rear guide-rods at a point intermediate the base and top member, and cam frames movable on said guide-rods and carrying rollers engaging the cams at opposite points.

8. In a pump, the combination with a cam-shaft and a pair of cams fixed thereon,

of a frame including a base, vertical columns, and a U-shaped top member, front and rear guide-rods secured between the top member and base, the front guide-rods being located outwardly of said cams and the rear guide-rods being located between the cams adjacent to the center of the U- shaped top member, bracing lugs formed integral with the columns intermediate the base and top member and embracing said front guide-rods, a bracing member supported on said cam-shaft and including va removable plate embracing said rear guiderods at a point intermediate the base and top member, a bracing plate connecting the tops of said columns at the front and formed integral therewith, and cam frames movable on said guide-rods and carrying rollers engaging the cams at opposite points.

9. In a pump, the combination with a cam shaft, of two reversible double-acting cams oppositely fixed thereon and a pair of cam frames cooperating with the cams and connected to a pair of pump rods, each of the cams being symmetrical with a flat base and continuously curved outer end and acting during each 180 of turning to effect an active stroke of its pump rod in one direction,each cam being so formed as to effect a uniform movement of its pump rod in both directions and produce a liquid discharge of substantially constant volumeand pressure In witness whereof, I have hereunto signed my name. o

SAMUEL w. LUITWIELER. 

